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       ibv_post_srq_recv  -  post  a  list  of work requests (WRs) to a shared
       receive queue (SRQ)


       #include <infiniband/verbs.h>

       int ibv_post_srq_recv(struct ibv_srq *srq, struct ibv_recv_wr *wr,
                             struct ibv_recv_wr **bad_wr);


       ibv_post_srq_recv() posts  the  linked  list  of  work  requests  (WRs)
       starting  with  wr  to  the  shared  receive queue (SRQ) srq.  It stops
       processing WRs from this  list  at  the  first  failure  (that  can  be
       detected immediately while requests are being posted), and returns this
       failing WR through bad_wr.

       The  argument  wr   is   an   ibv_recv_wr   struct,   as   defined   in

       struct ibv_recv_wr {
               uint64_t                wr_id;     /* User defined WR ID */
               struct ibv_recv_wr     *next;      /* Pointer to next WR in list, NULL if last WR */
               struct ibv_sge         *sg_list;   /* Pointer to the s/g array */
               int                     num_sge;   /* Size of the s/g array */

       struct ibv_sge {
               uint64_t                addr;      /* Start address of the local memory buffer */
               uint32_t                length;    /* Length of the buffer */
               uint32_t                lkey;      /* Key of the local Memory Region */


       ibv_post_srq_recv()  returns  0  on  success,  or the value of errno on
       failure (which indicates the failure reason).


       The buffers used by a WR can only be safely reused after WR the request
       is  fully  executed  and  a work completion has been retrieved from the
       corresponding completion queue (CQ).

       If a WR is being posted to a UD QP, the Global Routing Header (GRH)  of
       the  incoming  message  will  be  placed  in  the first 40 bytes of the
       buffer(s) in the scatter list.  If no GRH is present  in  the  incoming
       message,  then  the  first bytes will be undefined.  This means that in
       all cases, the actual data of the incoming message  will  start  at  an
       offset of 40 bytes into the buffer(s) in the scatter list.


       ibv_create_qp(3), ibv_post_send(3), ibv_post_recv(3), ibv_poll_cq(3)


       Dotan Barak <>